.\"-
.\" Copyright (c) 2001 Chris D. Faulhaber
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.Dd March 10, 2001
.Dt ACL_CALC_MASK 3
.Os
.Sh NAME
.Nm acl_calc_mask
.Nd calculate and set ACL mask permissions
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/acl.h
.Ft int
.Fn acl_calc_mask "acl_t *acl_p"
.Sh DESCRIPTION
The
.Fn acl_calc_mask
function
is a POSIX.1e call that calculates and set the permissions
associated with the
.Dv ACL_MASK
ACL entry of the ACL referred to by
.Fa acl_p .
.Pp
The value of new permissions are the union of the permissions
granted by the
.Dv ACL_GROUP , ACL_GROUP_OBJ , ACL_USER
tag types which
match processes in the file group class contained in the ACL
referred to by
.Fa acl_p .
.Pp
If the ACL referred to by
.Fa acl_p
already contains an
.Dv ACL_MASK
entry, its permissions shall be
overwritten; if it does not contain an
.Dv ACL_MASK
entry, one shall
be added.
.Sh RETURN VALUES
.Rv -std acl_calc_mask
.Sh ERRORS
The
.Fn acl_calc_mask
function fails if:
.Bl -tag -width Er
.It Bq Er EINVAL
Argument
.Fa acl_p
does not point to a pointer to a valid ACL.
.El
.Sh SEE ALSO
.Xr acl 3 ,
.Xr acl_get_entry 3 ,
.Xr acl_valid 3 ,
.Xr posix1e 3
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
.Sh HISTORY
POSIX.1e support was introduced in
.Fx 4.0 .
The
.Fn acl_calc_mask
function was added in
.Fx 5.0 .
.Sh AUTHORS
The
.Fn acl_calc_mask
function was written by
.An Chris D. Faulhaber Aq Mt jedgar@fxp.org .
